Luogu/CF444C/CF444C.cpp

@@ -1,151 +0,0 @@
-#include <iostream>
-#include <cmath>
-
-using std::cin;
-using std::cout;
-const char endl = '\n';
-
-struct node {
-    int l, r;
-    int color, new_color;
-    long long sum, sum_delta;
-    node *lchild, *rchild;
-
-    node()
-        : l(0), r(0), color(-1), new_color(-1), sum(0), sum_delta(0), lchild(nullptr), rchild(nullptr) {}
-
-    node(int _l, int _r)
-        : l(_l), r(_r), color(-1), new_color(-1), sum(0), sum_delta(0), lchild(nullptr), rchild(nullptr) {}
-
-    ~node() {
-        delete lchild;
-        delete rchild;
-    }
-
-    void pushup() {
-        sum = 0;
-        color = -1;
-
-        if (lchild != nullptr) {
-            sum += lchild->sum;
-            color = lchild->color;
-        }
-
-        if (rchild != nullptr) {
-            sum += rchild->sum;
-            color = color == rchild->color ? color : -1;
-        }
-    }
-
-    void pushdown() {
-        if (new_color == -1 || sum_delta == 0) return;
-
-        if (lchild != nullptr) {
-            if (sum_delta) {
-                lchild->sum_delta += sum_delta;
-                lchild->sum += sum_delta * (lchild->r - lchild->l + 1);
-            }
-
-            if (new_color != -1) {
-                lchild->color = lchild->new_color = new_color;
-            }
-        }
-
-        if (rchild != nullptr) {
-            if (sum_delta) {
-                rchild->sum_delta += sum_delta;
-                rchild->sum += sum_delta * (rchild->r - rchild->l + 1);
-            }
-
-            if (new_color != -1) {
-                rchild->color = rchild->new_color = new_color;
-            }
-        }
-
-        new_color = -1;
-        sum_delta = 0;
-    }
-};
-
-void build(node *&u, int l, int r) {
-    u = new node(l, r);
-
-    if (l == r) {
-        u->color = l;
-
-        return;
-    }
-
-    int mid = (l + r) >> 1;
-
-    if (l <= mid) build(u->lchild, l, mid);
-    if (r > mid) build(u->rchild, mid + 1, r);
-
-    u->pushup();
-}
-
-void modify(node *u, int l, int r, int new_color) {
-    if (l <= u->l && u->r <= r && ~u->color) {
-        u->sum += static_cast<long long>(std::abs(u->color - new_color)) * (u->r - u->l + 1);
-        u->sum_delta += std::abs(u->color - new_color);
-        u->color = u->new_color = new_color;
-
-        return;
-    }
-
-    int mid = (u->l + u->r) >> 1;
-    u->pushdown();
-
-    if (l <= mid) modify(u->lchild, l, r, new_color);
-    if (r > mid) modify(u->rchild, l, r, new_color);
-
-    u->pushup();
-}
-
-long long query(node *u, int l, int r) {
-    if (l <= u->l && u->r <= r) {
-        return u->sum;
-    }
-
-    int mid = (u->l + u->r) >> 1;
-    long long res = 0;
-
-    u->pushdown();
-
-    if (l <= mid) res += query(u->lchild, l, r);
-    if (r > mid) res += query(u->rchild, l, r);
-
-    return res;
-}
-
-int main() {
-    std::ios::sync_with_stdio(false);
-    cin.tie(nullptr);
-
-    int n, m;
-    node *root;
-
-    cin >> n >> m;
-
-    build(root, 1, n);
-
-    while (m--) {
-        int op, l, r;
-
-        cin >> op >> l >> r;
-
-        if (op == 1) {
-            int x;
-
-            cin >> x;
-
-            modify(root, l, r, x);
-        } else {
-            cout << query(root, l, r) << endl;
-        }
-    }
-
-    delete root;
-
-    return 0;
-}

Luogu/P1565/P1565.cpp

@@ -8,36 +8,7 @@ const char endl = '\n';
 const int N = 205;
 
 int n, m;
-long long g[N][N], s[N][N], c[N], ans;
+long long g[N][N], ans;
-
-bool check(int x) {
-    long long t = 0;
-
-    for (int i = x; i <= m; i++) {
-        t = std::min(t, c[i - x]);
-
-        if (c[i] > t) return true;
-    }
-
-    return false;
-}
-
-int calc() {
-    int l = 1, r = n, res = 0;
-
-    while (l <= r) {
-        int mid = (l + r) >> 1;
-
-        if (check(mid)) {
-            res = mid;
-            l = mid + 1;
-        } else {
-            r = mid - 1;
-        }
-    }
-
-    return res;
-}
 
 int main() {
     std::ios::sync_with_stdio(false);
@@ -49,17 +20,19 @@ int main() {
         for (int j = 1; j <= m; j++) {
             cin >> g[i][j];
 
-            s[i][j] = s[i - 1][j] + g[i][j];
+            g[i][j] += g[i - 1][j] + g[i][j - 1] - g[i - 1][j - 1];
         }
     }
 
     for (int i = 1; i <= n; i++) {
-        for (int j = i; j <= n; j++) {
+        for (int j = 1; j <= m; j++) {
-            for (int k = 1; k <= m; k++) {
+            for (int k = i; k <= n; k++) {
-                c[k] = c[k - 1] + s[j][k] - s[i - 1][k];
+                for (int l = j; l <= m; l++) {
+                    if (g[k][l] - g[k][j - 1] - g[i - 1][l] + g[i - 1][j - 1] >= 0) {
+                        ans = std::max(ans, static_cast<long long>(k - i + 1) * (l - j + 1));
+                    }
+                }
             }
-
-            ans = std::max(ans, static_cast<long long>(j - i + 1) * calc());
         }
     }